A Method for Optimizing the Elastic Support Span of a Gearbox in a Wind Turbine

Abstract

The invention discloses an optimization method for the wind-generation-set gear-case elastic support span. The optimization method includes the steps that 1, according to the initial parameter of a target wind generation set, a wind-generation-set transmission chain model containing a gear case model is set based on the many-body dynamics, and the initial parameter comprises an initial value of the span of a gear-case elastic support; 2, the value of the span in the wind-generation-set transmission chain model is continuously adjusted, and is subjected to modal and time domain analysis during adjusting every time, the potential resonant frequency obtained by modal and time domain analysis can be avoided after adjustment, and the adjusted wind-generation-set transmission chain model is output; 3, the value of the span in the adjusted wind-generation-set transmission chain model is continuously subjected to fine tuning optimization, the operating characteristic of a transmission chain in the wind-generation-set transmission chain model is best accordingly, and the best span value is obtained and output. By means of the optimization method, the resonance risk of the transmission chain can be avoided, and meanwhile the movement performance is best; the optimization method has the advantages of being simple in achieving method, reasonable in span design and high in optimization efficiency.

Description

technical field [0001] The invention relates to the technical field of design of a three-point support type wind power generating set, in particular to a method for optimizing the elastic support span of a gearbox in a wind power generating set. Background technique [0002] The transmission chain is the most important mechanical part of the wind turbine. Its main function is to convert the wind energy captured by the wind rotor into mechanical energy, which is then transmitted by a series of mechanical components to convert the mechanical energy into electrical energy in the generator. As an important mechanical part of the doubly-fed wind turbine, the gearbox mainly increases the speed of the wind rotor and transmits it to the generator to meet the speed required by the generator for power generation. The gearbox is usually supported by elastic elements and installed on the main frame. The front end of the gearbox is connected to the main shaft, and the main shaft is suppo...

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Problems solved by technology

However, when using the above-mentioned traditional calculation method and engineering calculation method, on the one hand, although the gearbox is large in size and high in quality, the box part is a shell structure, and the deformation under the load-bearing condition of the three-point support of the transmission chain is not considered in the calculation of the span. On the other hand, the transmission chain system of the wind turbine is a high-speed rotating mechanical system, and the elastic support span of the gearbox is strongly related to the low-order natural frequency of the transmission chain. The calculation of the span does not consider eliminating or avoiding the low-cost inherent frequency. The problem of frequency is currently only for the dynamic calculation of the transmission chain for new models to verify whether there is a risk of resonance within the operating speed range. If the calculation results show that a certain part of the transmission chain has a risk of resonance at a certain speed , the suggestion to avoid this speed is given, which cannot fundamentally solve the above problems from the design of the span itself

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